Cell Structure and Function

Which of the following statements about membrane asymmetry is true?

• Same composition on both sides
• Only carbohydrates differ
• Different proteins and lipids are found on each side
• Only cholesterol varies

Which of the following best describes the structure of transmembrane proteins?

• Are only on the outer surface
• Are always floating freely
• Span the entire membrane
• Are only on the inner surface

The term 'fluid' in the fluid mosaic model refers to:

• Presence of water
• Vertical movement only
• Lateral movement of components
• Temperature sensitivity

Which of the following is a function of cholesterol in the membrane?

• Increases membrane permeability
• Decreases membrane thickness
• Prevents excessive fluidity changes
• Acts as a transport channel

Which of the following is a key feature of the fluid mosaic model?

• Fixed positions of all components
• No movement of any kind
• Lateral mobility of membrane components
• Only vertical movement of components